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• android app crashes if keyboard was shown

  - by Jaume

  I have an activity that I force keyboard to appears using, InputMethodManager inputMethodManager=(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0); keyboard appears properly and also obscured when needed. Problem is when I finish the activity, app crashes. If the activity never shows keyboard or shows it without start editing text, it is finished with no errors but if you just write one single character or more, app will crash. How to solve it? thank you. method used to finish activity, boto_back.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { InputMethodManager inputMethodManager=(InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.toggleSoftInput(InputMethodManager.HIDE_IMPLICIT_ONLY, 0); finish(); } }); @Override public void onDestroy() { if (adMob != null) { // Destroy the AdView. adMob.destroy(); } super.onDestroy(); } logcat, 07-07 19:04:25.191: E/AndroidRuntime(8443): FATAL EXCEPTION: main 07-07 19:04:25.191: E/AndroidRuntime(8443): java.lang.RuntimeException: Unable to destroy activity {com.xxxx.xxxx/com.xxxx.projecte1.TabBar_iOSActivity}: java.lang.RuntimeException: Unable to destroy activity {com.xxxx.xxxx/com.xxxx.projecte1.webPush}: java.lang.NullPointerException 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2693) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:2711) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.access$2100(ActivityThread.java:121) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:976) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.os.Handler.dispatchMessage(Handler.java:99) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.os.Looper.loop(Looper.java:130) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.main(ActivityThread.java:3701) 07-07 19:04:25.191: E/AndroidRuntime(8443): at java.lang.reflect.Method.invokeNative(Native Method) 07-07 19:04:25.191: E/AndroidRuntime(8443): at java.lang.reflect.Method.invoke(Method.java:507) 07-07 19:04:25.191: E/AndroidRuntime(8443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 07-07 19:04:25.191: E/AndroidRuntime(8443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624) 07-07 19:04:25.191: E/AndroidRuntime(8443): at dalvik.system.NativeStart.main(Native Method) 07-07 19:04:25.191: E/AndroidRuntime(8443): Caused by: java.lang.RuntimeException: Unable to destroy activity {com.xxxx.xxxx/com.xxxx.projecte1.webPush}: java.lang.NullPointerException 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2693) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2603) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.LocalActivityManager.dispatchDestroy(LocalActivityManager.java:622) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityGroup.onDestroy(ActivityGroup.java:85) 07-07 19:04:25.191: E/AndroidRuntime(8443): at com.xxxx.projecte1.TabBar_iOSActivity.onDestroy(TabBar_iOSActivity.java:417) 07-07 19:04:25.191: E/AndroidRuntime(8443): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:2680) 07-07 19:04:25.191: E/AndroidRuntime(8443): ... 11 more

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• why is there different id syntax in the Android docs?

  - by darren

  This page in the Android documentation defines an element id as follows: <TextView android:id="@+id/label" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Type here:" /> However this page defines it as: <EditText id="text" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:textColor="@color/opaque_red" android:text="Hello, World!" /> I thought I had a decent understanding of what was going on until I saw this second example. In the first case, you need the + character so that id 'label' is added to the R file, correct? In the second case, would the EditText's id not be added to the R file because it does not contain the + character? Also, the second example does not include the android namespace on the id. Does having or not having the Android namespace affect whether that id will be added to the R file? Thanks for any clarification.

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• Android number input with plus and minus sign.

  - by alaak

  Hi, I am developing in android and I would like an input field for numbers, where the user can select the correct number using the plus sign at the top and the minus sign at the bottom of the input field. I know this works for date picker. Is there some property or something similar to make this available for any integer number input field? Thanks

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• What is the difference between android:layout_width and android:width

  - by virsir

  I do not know the difference between these two attributes and for the height also. Take a TextView for example, what would happen if I set its layout_width to wrap_content and set its width to 50 dip?

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• Android Emulator not loading on netbeans

  - by Drahcir

  I just downloaded the android sdk from the adnroid site and followed this tutorial to set it up on netbeans. Everything to seem to have installed fine but whenever i try to run the application this window pops up: What I am assuming it asking me to choose the emulator, but it is not showing up on the list. Is there a reason why?

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• Android WebView and default browser with different UserAgent

  - by Udi I

  From some reason on several android devices, I'm getting different User Agent from the browser and from my application's WebView. I have used this line of code to get the UA in the app: new WebView(this).getSettings().getUserAgentString(); This is the part with the difference The application retruns: HTC One X Build While the browser returns: HTC_One_X Build Notice the underscores in the browser's version. Any ideas what causes the difference? Tx!

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• Android: Learning the platform, have any app suggestions?

  - by David

  I'm beginning to learn mobile programming on the Android platform. I'm up for working with any particular base SDK. I just want to hear some suggestions from the community about what types of applications I should start with to help learn more advanced interactions with the platform. There are of course the Standard Hello World, calculator, etc. But by now I am bored with all of those. What do you all make when learning a new language?

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• What is Android's payment system like?

  - by dootcher

  I've heard that Apple pays the developers in lump sums (I forget how often) for their app downloads. My question is does Google work the same way with Android? If not, how do they operate their payment system? Kind of a side question as well, but how do Apple and Google get you the money from other countries? Do they automatically convert it for you and take a cut for swapping the currency or is that your job?

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• How to optimize 'class name' in Android XML Layout ?

  - by Mac

  Hello, I am using some custom components in my project for that I am using following code. <view class="com.android.mypackage.myclass" id="@+id/button" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@android:drawable/button" android:padding="10dip" /> Its working perfectly fine, I am using this code near about 35 times in my application. so while creating new clone application from same project, I need to update package name in 35 places. Is there any way to reduce these efforts? I had tried with "class="@string/class_name" but its not working.

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• Android - Volume Buttons used in my application

  - by Iuliu Atudosiei

  Hi, I need to use volume buttons to control a variable parameter in my application. I use Activity.onKeyDown to get notified when the button is pressed but the media volume is also increased. Android is doing something like below when I press the volume key: 1. increase media / ringtone volume 2. pass the event to my application Is there a way to avoid increasing the system volume and use volume key only for my application ? Thanks

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• Translate a picture to text on Android?

  - by Keith

  I know that google goggles will translate a picture to text. What I want to do is allow the user to take a picture (no problem), translate that picture to text(?) and then do some processing on the text (no problem). Is there any API on android that allows this? or is there any way to programtically communicate with google goggles? I would hate to have the user use goggles then select the saved file with my app.....

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• how to clear the cached images in Android?

  - by Praveen Chandrasekaran

  How to clear the cached image from memory programatically in android? i am iconic list view when i scroll its reloads the image.So its produce the OutofMemoryError. i want clear the cache while gets this exception. how to do that? any help?

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• Preconfigure Android Emulator with location?

  - by Janusz

  I want to run automated tests with location on the android emulator. I can setup coordinates via Telnet, but that means starting up a console and manually configuring the emulator before running my junit tests. Is there a possibility to preconfigure the emulator with a KML file or something like that to ensure that there are always coordinates available?

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• Android real time multiplayer over LAN

  - by Heigo

  I've developed several games for the android platform and now planning to create my first multiplayer game. What I have in mind is basically just a 2-player game witch you can play with 2 phones over local area connection/WiFi. Both phones need to be able to pass 3 integer values to the other phone in real time. So far I have considered using Socket's, but before I dig into it too deep I wanted to ask if there might be a better approach? Thanks!

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• Ubuntu 14.04 and Android, can't see phone on my computer

  - by user3527983

  I have installed gMTP and tried to follow this tutorial to solve this problem: http://www.webupd8.org/2013/01/upgrade-to-gvfs-with-mtp-support-in.html But neither worked. I tried to connect both my phone (Nexus 4) and my dad's phone (Galaxy Note 2), and neither is being detected by Ubuntu. They don't show up on my files and on gMTP. Is there another fix? or something more specific for Android 4.3 and Ubuntu 14.04

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• Does switching activities in Android start a fresh JVM

  - by Benju

  Does switching activities in Android start a fresh JVM? It seems like each activity is meant to run as its own "main" method. If I have a singleton (via Guice, not an actual singleton in this case) should I expect to be re-creating it every time I switch activities?

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• Android Camera takePicture function does not call Callback function

  - by Tomáš 'Guns Blazing' Frcek

  I am working on a custom Camera activity for my application. I was following the instruction from the Android Developers site here: http://developer.android.com/guide/topics/media/camera.html Everything seems to works fine, except the Callback function is not called and the picture is not saved. Here is my code: public class CameraActivity extends Activity { private Camera mCamera; private CameraPreview mPreview; private static final String TAG = "CameraActivity"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.camera); // Create an instance of Camera mCamera = getCameraInstance(); // Create our Preview view and set it as the content of our activity. mPreview = new CameraPreview(this, mCamera); FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mPreview); Button captureButton = (Button) findViewById(R.id.button_capture); captureButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Log.v(TAG, "will now take picture"); mCamera.takePicture(null, null, mPicture); Log.v(TAG, "will now release camera"); mCamera.release(); Log.v(TAG, "will now call finish()"); finish(); } }); } private PictureCallback mPicture = new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { Log.v(TAG, "Getting output media file"); File pictureFile = getOutputMediaFile(); if (pictureFile == null) { Log.v(TAG, "Error creating output file"); return; } try { FileOutputStream fos = new FileOutputStream(pictureFile); fos.write(data); fos.close(); } catch (FileNotFoundException e) { Log.v(TAG, e.getMessage()); } catch (IOException e) { Log.v(TAG, e.getMessage()); } } }; private static File getOutputMediaFile() { String state = Environment.getExternalStorageState(); if (!state.equals(Environment.MEDIA_MOUNTED)) { return null; } else { File folder_gui = new File(Environment.getExternalStorageDirectory() + File.separator + "GUI"); if (!folder_gui.exists()) { Log.v(TAG, "Creating folder: " + folder_gui.getAbsolutePath()); folder_gui.mkdirs(); } File outFile = new File(folder_gui, "temp.jpg"); Log.v(TAG, "Returnng file: " + outFile.getAbsolutePath()); return outFile; } } After clicking the Button, I get logs: "will now take picture", "will now release camera" and "will now call finish". The activity finishes succesfully, but the Callback function was not called during the mCamera.takePicture(null, null, mPicture); function (There were no logs from the mPicture callback or getMediaOutputFile functions) and there is no file in the location that was specified. Any ideas? :) Much thanks!

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• Add different themes to the android application

  - by mudit

  hi all. i want to add themes to my android application. In the application, user will have options to changes theme of the application. Just like OIShopping List appplication. Please help how do i implement this kind of structure to my application. Any help, tutorials, guidance are highly appreciated. thanks..

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• Android ImageButton not firing the onclick event, what is wrong with my code?

  - by kimo

  I have very simple code that includes ImageButton with OnClickListener that points to another Activity, the click on the ImageButton doesn't fire the onClick (The same problem was with Button) : public class ToolsActivity extends Activity { private ImageButton btnCamera; final Context context = ToolsActivity.this; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tools); this.btnCamera = (ImageButton) findViewById(R.id.cameraButton); this.btnCamera.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(context,MainActivity.class); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_tools, menu); return true; } XML: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingLeft="16dp" android:paddingRight="16dp" > <ImageButton android:id="@+id/cameraButton" android:layout_width="100dp" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:background="@drawable/btncamera" android:contentDescription="@string/desc" />

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• Insert space after autocompletion in Android

  - by Leafsoft

  Hello, I'm an Android developer and when my apps summon the keyboard, choosing an option in the autocompletion menu inserts the chosen word but not a space after it. Is there a way to make a space appear automatically I trigger autocompletion? Thank you in advance.

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• How to transfer SQLite db to web server on android phone (android)

  - by Aditya Mehta

  Hello, I have "BackUpContacts.db" database in SQLiteDatabase, it has a table named "ContactInfo" with column names ContactId, ContactName, MobilePhone1, MobilePhone2, OfficePhone1, OfficePhone2, OfficePhone3, HomePhone1, HomePhone2 and TokenId. What i want is to transfer all data of "ContactInfo" table to the mysql database system at some server (means server has also a table similar to "ContactInfo", where all data of "ContactInfo" will be copied). The last important thing which i want is that, whenever i want to get contacts(of a specified TokenId) i can backup all those from server to the mobile device in an xml file. in short, can here anyone help me how to transfer sqlite db to a web server?

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• Click two buttons at the same time in Android

  - by sw333t

  I have two buttons that both have onTouchListeners and perform an action when pressed down. Why do they not work if you try to click both at the same time? I'm building for Android 1.6. I don't have a real device to test on, and you can't test clicking two things at the same time in the emulator. Thanks for any help.

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• Using Android's `Timer.schedule` in Python

  - by Sridhar Ratnakumar

  Could someone explain how to use the Timer.schedule - that is used for scheduling tasks - in Python? Note that Python's time.sleep will not work in Android.

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• An example of when to have multiple "activities" in an Android application

  - by Benju

  I seem to be missing something obvious here, why would I want more than one activity per application in Android? Does somebody have some solid examples?

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• Using ListViews on Android?

  - by Robert

  I am just getting started with the Android SDK and I had a quick question. I am trying to set up a ListView with a rectangle of color on the left and then a bit of text for each row. I also want to make it so I can click each entry in the list and open a new activity to display some information (similar to the contact list). Anyone have any examples to help me out?

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